Norton, Lin S., author
Routledge, 2009
Buku Teks
Edited by Norbert Pachler; Ana Redondo
Routledge, 2007
Buku Teks
Furlonger, Clare
David Fulton, 2004
Buku Teks
Howlin, Patricia, author
John Wiley & Sons, 1999
Buku Referensi
Horton, Sarah, author
Yale University Press, 2000
Buku Teks